Verily you shall encounter a people who claim

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"Verily you shall encounter a people who claim that they are calling you unto Allah's Book when in fact they have tossed it behind their backs."

- Ibn Mas`ud - Allah be well-pleased with him
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-Abu Bakr- Allah be well-pleased with him - said:

"What earth could carry me, what heaven could shade me if I spoke about a single verse of Allah's Book according to my mere opinion or to say something of which I have no knowledge?"9

- `Umar - Allah be well-pleased with him - said: 
"I only fear for you two matters: A man that interprets the Qur'an in a way other than the interpretation in which it is meant, and a man who vies with his brother in acquiring property."10

- He also said: "I do not fear for this Community a believer whose faith holds him in check nor a dissolute man whose corruption is evident. However, I fear for it a man who read the Qur'an until he slickened his tongue with it, then he misconstrues it."11

- He also said: 
"Beware of those who put forward opinions (ashab al-ra'i) for they are the enemies of the Sunna. They have despaired of memorizing the Prophet's -- Allah bless and greet him -- narrations and have resorted to forwarding opinions. As a result they went astray and misguided others."12

- He also said:
"Certain people shall appear who will dispute with you concerning the Qur'an: reply to them with the Sunan. For the possessors of the Sunan are the most knowledgeable about Allah's Book."13

`Ali - Allah be well-pleased with him - said the same thing to Ibn `Abbas - Allah be well-pleased with him - when he sent him to debate the Khawarij:

"Do not argue with them by means of the Qur'an for it bears many interpretations (innahu dhu wujuh), but argue with them by means of the Sunna."14

Another version states that Ibn `Abbas said: 

"O Commander of the believers, I know the Qur'an better than them for it is in our homes that it was revealed," whereupon `Ali replied: "You said the truth, but the Qur'an is comprehensive in its phrasing (jammal) and bears many interpretations. You will say [it means one thing] and they will say [it means another]. Rather, argue with them by means of the Sunan, for they will not be able to find an escape from them."15